java将十进制转换为二进制

Question

代码大部分都完成了，但我的代码打印不正确，打印出来的是110，而不是011。我遇到的问题需要将“110”反转为“011”

import java.util.Scanner; 

public class LabProgram {   
    public static void main(String[] args) { 

Scanner scan = new Scanner(System.in);


   int num, binaryNum = 0;
   int i = 1, rem;

   num = scan.nextInt();

   while (num != 0)
   {
      rem = num % 2;
      num /= 2;
      binaryNum += rem * i;
      i *= 10;
   }


 System.out.println(binaryNum);
}
}

Answer 1

您可以直接打印每个二进制数字，而无需将其存储在binaryNum

while (num != 0) {
    System.out.print(num % 2);
    num /= 2;
}

System.out.println();

Answer 2

然后使用如下字符串：

   int num = scan.nextInt();

   String s = "";
   while (num != 0) {
    int   rem = num % 2;
      num /= 2;
      s = s + rem; // this concatenates the digit to the string in reverse order.

      // if you want it in normal order, do it ->  s = rem + s;
   }
   System.out.println(s);

Answer 3

您可以简单地使用Integer#tobinarysting（int）以二进制字符串的形式返回结果

        Scanner scan = new Scanner(System.in);

        int value = scan.nextInt();

        System.out.println(Integer.toBinaryString(value));